During the restart of a Terminal Server, inactive TS ports should be deleted. When these inactive ports are not deleted, over time, a server can become sluggish or even hang because of this. When there are a lot of Inactive TS Ports in the registry, printer redirection may also suffer.

If you are experiencing OS performance, Print spooler or RDS printer redirection hangs, check the presences of Inactive TS Ports under the key:

HKLM\SYSTEM\CurrentControlSet\Control\DeviceClasses\{28d78fad-5a12-11d1-ae5b-0000f803a8c2}\##?#Root#RDPBUS#0000#{28d78fad-5a12-11d1-ae5b-0000f803a8c2}

If the subkeys with #TS001\device parameters in it have a “Port Description” with “Inactive TS Port” then the entier root key should be deleted.

With the powershell script below, it is possible to delete these Inactive TS Ports from a remote machine. The scripts reads an OU in the Active Directory where all RDSH servers are located and then it will delete all Inactive TS Ports from those servers.

#Get RDSH Servers
$servers = Get-ADComputer -Filter * -SearchBase "OU=Netherlands, OU=Session Hosts, OU=RDS2012, OU=Servers, OU=Infra,DC=infra,DC=imtech,DC=NL"  

#Delete inactive TS Ports (https://archive.codeplex.com/?p=inactivetsport)
foreach ($server in $servers) {
    $RemoteComputer =$server.name 
    if (Test-Connection -ComputerName $RemoteComputer -Count 1 -ErrorAction SilentlyContinue) { 
        Invoke-Command -ComputerName $RemoteComputer -ScriptBlock {
            $Gegevens = Get-ChildItem -path 'HKLM:SYSTEM\CurrentControlSet\Control\DeviceClasses\{28d78fad-5a12-11d1-ae5b-0000f803a8c2}\##?#ROOT#RDPBUS#0000#{28d78fad-5a12-11d1-ae5b-0000f803a8c2}' -Recurse
            ($gegevens.Name ) -replace "\\Device parameters" | Select-Object -Unique | ForEach-Object { 
                $subkey = ($_ -replace "HKEY_LOCAL_MACHINE\\" , "HKLM:\") + "\Device Parameters"         
                $PortDescription = (Get-itemproperty -path $subkey)."Port Description"
                if ($PortDescription -eq "Inactive TS Port") {
                    $subkeydelete = ($_ -replace "HKEY_LOCAL_MACHINE\\" , "HKLM:\")
                    write-host "delete subkey from $env:COMPUTERNAME => $subkeydelete"
                    Remove-Item -Path $subkeydelete -Recurse                   
                }
            }
        } 
    }
}

For more information about this issue in Windows Server 2008 please check the site: https://archive.codeplex.com/?p=inactivetsport